CN110261638B - Flange type liquid metal rotating speed sensor and rotating speed measuring method - Google Patents
Flange type liquid metal rotating speed sensor and rotating speed measuring method Download PDFInfo
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- CN110261638B CN110261638B CN201910453613.3A CN201910453613A CN110261638B CN 110261638 B CN110261638 B CN 110261638B CN 201910453613 A CN201910453613 A CN 201910453613A CN 110261638 B CN110261638 B CN 110261638B
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- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 71
- 230000006698 induction Effects 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 description 6
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 4
- 229910052733 gallium Inorganic materials 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 229910000846 In alloy Inorganic materials 0.000 description 2
- 229910001128 Sn alloy Inorganic materials 0.000 description 2
- 230000004323 axial length Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- RHZWSUVWRRXEJF-UHFFFAOYSA-N indium tin Chemical compound [In].[Sn] RHZWSUVWRRXEJF-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/26—Devices characterised by the use of fluids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a flange type liquid metal rotating speed sensor and a rotating speed measuring method; the flange type liquid metal rotating speed sensor comprises an insulated shell shaft barrel, a speed measuring rotor, a sealing end cover and a flange sealing end cover; the shell shaft is sleeved on the speed measuring rotor, the sealing end cover and the flange sealing end cover are respectively fixed at the two axially opposite ends of the shell shaft and the speed measuring rotor to form a sealed speed measuring cavity, and liquid metal is stored in the speed measuring cavity; an induction electrode is arranged on the shell shaft barrel, and an input electrode is arranged on the tachometer rotor; the induction electrode and the input electrode are immersed in liquid metal and are respectively connected with the same speed measuring circuit; when the speed measurement is carried out, current flows into the liquid metal through the input electrode, and when the input electrode and the sensing electrode are opposite in the same direction, a current pulse signal is output to the speed measurement circuit through the sensing electrode. And further, the safety and stability of the flange type liquid metal rotating speed sensor are effectively improved.
Description
Technical Field
The invention relates to the field of rotating speed measuring devices, in particular to a flange type liquid metal rotating speed sensor and a rotating speed measuring method.
Background
The rotation speed sensor is a sensor that converts the rotation speed of a rotating object into an electric quantity output. The rotation speed measurement is mainly carried out by directly transmitting the rotation state in the prior art, but the phenomenon is particularly obvious in an electromechanical system because a certain amount of load and resistance are generated on a speed measuring shaft by a speed measuring sensor. In addition, the bearing bush of the internal sensor is continuously rubbed under the electrified condition, is extremely easy to generate heat, and even generates electric sparks after abrasion, the performance of the electric connector is seriously affected, and dangerous accidents are caused.
Accordingly, the prior art has drawbacks and needs to be improved and developed.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides a flange type liquid metal rotating speed sensor and a rotating speed measuring method, which aim to solve the problem of poor stability of the rotating speed sensor in the prior art.
The technical scheme adopted for solving the technical problems is as follows: a flange type liquid metal rotation speed sensor for measuring a rotation speed of an object, comprising:
the device comprises an insulated shell shaft barrel, a speed measuring rotor, a sealing end cover and a flange sealing end cover;
the shell shaft is sleeved on the speed measuring rotor, the sealing end cover and the flange sealing end cover are respectively fixed at two axially opposite ends of the shell shaft and the speed measuring rotor to form a sealed speed measuring cavity, and liquid metal is stored in the speed measuring cavity;
an induction electrode is arranged on the shell shaft barrel, and an input electrode is arranged on the tachometer rotor; the induction electrode and the input electrode are immersed in liquid metal and are respectively connected with the same speed measuring circuit;
when the speed measurement is carried out, current flows into the liquid metal through the input electrode, and when the input electrode and the sensing electrode are opposite in the same direction, a current pulse signal is output to the speed measurement circuit through the sensing electrode.
Further, the speed measuring rotor is adaptively connected with a rotating shaft; the rotating shaft is arranged to be a rotating speed output shaft or a speed measuring shaft connected with the rotating speed output shaft through a coupler.
Further, the tachometer rotor is arranged to be hollow and cylindrical, and comprises a rotor inner surface deviating from the shell shaft barrel, and one end of the rotating shaft is fixed in the rotor inner surface of the tachometer rotor.
Further, the flange type liquid metal rotating speed sensor further comprises a key, a sliding key groove is formed in the inner surface of one end, close to the sealing end cover, of the speed measuring rotor, and the key is arranged in the sliding key groove in a sliding mode and used for fixing a rotating shaft on the inner surface of the rotor.
Further, the housing shaft comprises a sleeve inner surface close to the tachometer rotor, and the tachometer rotor further comprises a rotor outer surface close to the housing shaft; the induction electrode is arranged on the inner surface of the sleeve, the input electrode is arranged on the outer surface of the rotor, and the induction electrode and the input electrode are arranged on the same plane.
Further, the flange sealing end cover is provided with a flange plate facing the rotor, and the flange plate is used for axially mounting the housing shaft barrel, the speed measuring rotor and the rotating shaft.
Further, a first sealing groove surrounding the rotating shaft is formed in the surface, facing the speed measuring rotor, of the flange sealing end cover and the sealing end cover; a first sealing gasket is arranged in the first sealing groove.
Further, a seal adjusting ring encircling the rotating shaft is arranged on the surface, facing the speed measuring rotor, of the flange seal end cover and the seal end cover.
Further, a second sealing groove surrounding the rotating shaft is formed in the surface, facing the shell shaft barrel, of the flange sealing end cover and the sealing end cover; and a second sealing gasket is arranged in the second sealing groove.
The invention solves the technical problem by adopting another technical scheme as follows: a rotational speed measurement method for measuring a rotational speed of an object to be measured, comprising: connecting the rotating speed output end of an object to be measured with the speed measuring rotor of the flange type liquid metal rotating speed sensor;
after an object to be detected is started, the rotating speed R=N/(m×T) of the object to be detected, wherein N is the number of current pulse signals received by the current detection circuit in a time period T; m is the number of the input electrodes.
Compared with the prior art, the invention provides a flange type liquid metal rotating speed sensor and a rotating speed measuring method; the flange type liquid metal rotating speed sensor comprises: the device comprises an insulated shell shaft barrel, a speed measuring rotor, a sealing end cover and a flange sealing end cover; the shell shaft is sleeved on the speed measuring rotor, the sealing end cover and the flange sealing end cover are respectively fixed at two axially opposite ends of the shell shaft and the speed measuring rotor to form a sealed speed measuring cavity, and liquid metal is stored in the speed measuring cavity; an induction electrode is arranged on the shell shaft barrel, and an input electrode is arranged on the tachometer rotor; the induction electrode and the input electrode are immersed in liquid metal and are respectively connected with the same speed measuring circuit; when the speed measurement is carried out, the current flows into the liquid metal through the input electrode, and when the input electrode and the sensing electrode are opposite in the same direction, a current pulse signal is output to the speed measurement circuit through the sensing electrode. And further, the load on the flange type liquid metal rotating speed sensor is effectively avoided, and the safety and stability of the flange type liquid metal rotating speed sensor are improved.
Drawings
Fig. 1 is a schematic perspective view of a flange type liquid metal rotation speed sensor according to the present invention.
Fig. 2 is a schematic perspective partial sectional view of a flange type liquid metal rotation speed sensor according to the present invention.
Fig. 3 is a schematic side view of a flange type liquid metal rotation speed sensor according to the present invention.
FIG. 4 is a schematic view in partial section taken along the direction I-I in FIG. 3.
Fig. 5 is a schematic perspective partial sectional view of the cooperation relationship between the tachometer rotor and the seal adjusting ring of the flange type liquid metal rotation speed sensor in the invention.
Fig. 6 is a schematic perspective partial sectional view of the cooperation relationship of the tachometer shaft, tachometer rotor and seal adjusting ring of the flange type liquid metal rotation speed sensor in the invention.
Fig. 7 is a perspective view of a tachometer shaft barrel of the flange type liquid metal rotation speed sensor of the present invention.
Fig. 8 is another perspective partial cross-sectional schematic view of a flange type liquid metal rotation speed sensor according to the present invention.
Reference numerals illustrate:
10. a flange type liquid metal rotating speed sensor; 11. a housing shaft; 12. a speed measuring rotor; 13. sealing the end cover; 14. a flange seal end cap; 15. a speed measuring cavity; 16. a speed measuring shaft; 18. a seal adjustment ring; 111. an induction electrode; 112. the inner surface of the shaft barrel; 121. an input electrode; 122. a rotor inner surface; 123. an outer surface of the rotor; 124. a key; 125. sliding key groove; 141. a flange plate; 171. a first seal groove; 172. a second seal groove; 173. a first gasket.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear and clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, the invention provides a flange type liquid metal rotation speed sensor 10 for measuring the rotation speed of an object, wherein the flange type liquid metal rotation speed sensor 10 comprises a housing shaft 11, a speed measuring rotor 12, a sealing end cover 13 and a flange sealing end cover 14, and the housing shaft 11, the speed measuring rotor 12, the sealing end cover 13 and the flange sealing end cover 14 are all insulators. The housing shaft 11 is sleeved on the tachometer rotor 12, the seal end cover 13 and the flange seal end cover 14 are respectively fixed on two axially opposite ends of the housing shaft 11 and the tachometer rotor 12, so as to form a sealed tachometer cavity 15, and liquid metal (not shown) is stored in the tachometer cavity 15. Further, the liquid metal comprises gallium indium alloy or gallium indium tin alloy; it can be understood that the axial length of the tachometer rotor 12 is less than or equal to the axial length of the housing shaft 11; namely, the two axially opposite ends of the housing shaft 11 are flush with each other on the tachometer rotor 12, or the two axially opposite ends of the tachometer rotor 12 are concave relative to the housing shaft 11.
Referring to fig. 3 and fig. 4 in combination, the housing shaft 11 is provided with an induction electrode 111, and the tachometer rotor 12 is provided with an input electrode 121; specifically, an induction electrode 111 is disposed on a surface of the housing shaft 11 facing the tachometer cavity 15, and an input electrode 121 is disposed on a surface of the tachometer rotor 12 facing the tachometer cavity 15; namely, an induction electrode 111 is arranged on the surface of the housing shaft 11 close to the tachometer rotor 12, and an input electrode 121 is arranged on the surface of the tachometer rotor 12 close to the housing shaft 11.
Further, the sensing electrode 111 and the input electrode 121 are immersed in liquid metal and are connected to the same tachometer circuit respectively. It should be understood that, when the sensing electrode 111 and the input electrode 121 are simultaneously immersed in the liquid metal and are respectively connected to two ends of the tachometer circuit, and when the sensing electrode 111 and the input electrode 121 are distributed in the same radial direction, the liquid metal electrically conducts the sensing electrode 111 and the input electrode 121, that is, the liquid metal electrically conducts the tachometer circuit, it should be emphasized that the tachometer circuit is designed in the prior art, and is mainly used for detecting intermittent current, that is, for detecting a current pulse signal, and the specific design is not the invention point of the present invention, and the present invention is only used for application and is not repeated herein.
Further, when the speed measurement is performed, the current flows into the liquid metal through the input electrode 121, and when the input electrode 121 and the sensing electrode 111 are opposite in the same direction, a current pulse signal is further output to the speed measurement circuit through the sensing electrode 111. I.e. the current enters the liquid metal through the input electrode 121, and if and only if the input electrode 121 is opposite to the sensing electrode 111 in the same direction, the current enters the sensing electrode 111 from the liquid metal, so that the tachometer circuit is conducted, and a current pulse signal is detected. The flange type liquid metal rotating speed sensor can accurately measure the rotating speed of the measured object of the object to be measured under the condition of no load, and the stability and the safety of the flange type liquid metal rotating speed sensor are obviously improved; meanwhile, the response speed of the flange type liquid metal rotating speed sensor is remarkably improved.
Referring to fig. 5 and 6 in combination, the tachometer rotor 12 is adapted to be connected to a rotating shaft; the rotating shaft is set to be a rotating speed output shaft or a speed measuring shaft 16 connected with the rotating speed output shaft through a coupler; it will be appreciated that the tachometer rotor 12 may be directly connected to the tachometer output shaft, or the tachometer rotor 12 may be directly connected to the tachometer shaft 16, and then the tachometer shaft 16 is fixedly connected to the tachometer output shaft via a coupling.
Further, the tachometer rotor 12 is configured as a hollow cylinder having an inner diameter; the tachometer rotor 12 may be directly connected to the tachometer output shaft. When the rotating speed output shaft is nonmagnetic and the shaft diameter is matched with the inner diameter of the rotor; namely, when the shaft diameter of the rotating speed output shaft is matched with the inner diameter of the rotor, the rotating speed output shaft can be directly connected with the rotor.
Further, the tachometer shaft 16 is fixed on the tachometer rotor 12, and the other end is fixedly connected with the rotational speed output shaft through a coupling (not shown); it will be appreciated that the shaft diameter of the rotational speed output shaft at this time may be smaller or larger than the inner diameter of the rotor, which may also have a certain weak magnetism; it should be noted that, when the rotation speed output shaft is non-magnetic, and the shaft diameter is matched with the inner diameter of the tachometer rotor 12, a coupling may be connected to a tachometer shaft 16, so as to realize synchronous rotation of the tachometer rotor 12 and the rotation speed output shaft. It should be noted that, the tachometer rotor 12 is not externally connected with other loads, so that friction heating inside the flange type liquid metal rotating speed sensor is effectively avoided, and stability and safety are improved.
That is, the speed measuring rotor in the present invention includes two cases when adapting to the rotating shaft, and in either way, the adapting relationship between the rotor and the rotating shaft is the same, and the rotating shaft in the following embodiments of the present invention is described only by using the scheme that the rotating shaft is set as the speed measuring shaft 16, but it should be noted that when the rotating shaft is set as the rotating speed output shaft, the speed measuring shaft is also the same as the rotating shaft is set as the speed measuring shaft 16, and the description is omitted again; furthermore, the matching relationship between the flange type liquid metal rotation speed sensor 10 of the present invention, except for the tachometer rotor 12, and the rotation shaft is also described by the tachometer shaft 16; when the rotating shaft is set as the rotating speed output shaft, the matching relation between other components except the speed measuring rotor 12 of the flange type liquid metal rotating speed sensor 10 and the rotating shaft is the same as that of the rotating shaft set as the speed measuring shaft 16, and the description is omitted again. Referring further to fig. 7, the tachometer rotor 12 includes a rotor inner surface 122 facing away from the housing shaft 11, and a rotor outer surface 123 adjacent to the housing shaft 11; one end of the rotating shaft is fixed in the rotor inner surface 122 of the tachometer rotor 12, i.e. one end of the tachometer shaft 16 or the rotating speed output shaft is fixed in the rotor inner surface 122 of the tachometer rotor 12; the input electrode 121 is disposed on the rotor outer surface 123. Meanwhile, the housing shaft 11 includes a shaft inner surface 112 adjacent to the tachometer rotor 12, and the induction electrode 111 is disposed on the shaft inner surface 112. It should be noted that, in the present invention, the number of the sensing electrodes 111 is set to one, and the number of the input electrodes 121 may be set to one or more; meanwhile, the sensing electrode 111 and the input electrode 121 are disposed on the same plane, that is, the sensing electrode 111 and the input electrode 121 are distributed on the same section of the tachometer rotor 12 and the housing shaft 11 along the radial direction. And further, it is ensured that each input electrode 121 rotates one circle along with the tachometer rotor 12, and is distributed with the sensing electrodes 111 in the same radial direction.
Meanwhile, the liquid metal also has a certain resistance, and when the tachometer rotor 12 rotates, the liquid metal also rotates along with the tachometer rotor, and the resistance of the tachometer rotor is further increased; this results in a longer distance of the input electrode 121 and the sense electrode 111, which, although immersed in liquid metal at the same time, are not electrically conductive; it will be appreciated that the distance between the sensing electrode 111 and the input electrode 121 is minimized if and only if the input electrode 121 and the sensing electrode 111 are diametrically opposed, and that the current in the input electrode 121 is now able to enter the sensing electrode 111 through the liquid metal, thereby generating a current pulse signal.
Preferably, the flange type liquid metal rotation speed sensor further includes a key 124, a sliding key slot 125 is formed on an inner surface of the end, close to the seal end cover 13, of the tachometer rotor 12, and the key 124 is slidably disposed in the sliding key slot 125, and is used for fixing a rotation shaft on the inner surface 122 of the rotor, that is, for fixing the tachometer shaft 16 or the rotation speed output shaft on the inner surface 122 of the rotor. It will be appreciated that the key 124 is free to slide within the sliding key slot 125, thereby facilitating the mounting of either the tachometer shaft 16 or the rotatable output shaft to the tachometer rotor 12.
Further, the flange sealing end cover 14 is provided with a flange 141 facing the tachometer rotor 12, and the flange 141 is used for axially mounting the housing shaft 11, the testing rotor 12 and the rotating shaft, i.e. the flange 141 is used for axially mounting the housing shaft 11, the tachometer rotor 12, and for axially mounting the measured tachometer shaft 16 or the rotating speed output shaft. Specifically, the end of the sealing end cover 13 contacting the rotor extends toward the rotor to form a flange 141; when the flange type liquid metal rotation speed sensor is provided with the speed measuring shaft 16, one end of the speed measuring shaft 16 passes through the sealing end cover 13, enters the inner surface of the speed measuring rotor 12, finally passes through the flange 141, passes out of the speed measuring rotor 12, and is flush with or protrudes from the surface of the flange sealing end cover 14, which is away from the speed measuring rotor 12. When the flange type liquid metal rotation speed sensor is provided with the rotation speed output shaft, the rotation speed output shaft is the same as the rotation speed measuring shaft 16, and the description is omitted again.
Referring to fig. 8 in combination, further, on the surface of the flange seal end cover 14 and the seal end cover 13 facing the tachometer rotor 12, a first seal groove 171 surrounding the rotation shaft is formed, that is, a first seal groove 171 surrounding the tachometer shaft 16 or the rotation speed output shaft is formed, and a first seal gasket 173 is disposed in the first seal groove 171; it can be appreciated that by providing the first seal groove 171 and the first seal pad 173, leakage of the liquid metal in the speed measuring cavity 15 at the rotor can be effectively avoided; and further, the induction electrode 111 and the input electrode 121 cannot be immersed in the liquid metal at the same time, so that the induction electrode 111 and the input electrode 121 can be conducted in time, and the measurement stability and safety of the flange type liquid metal rotation speed sensor are improved.
Furthermore, on the surface of the flange seal end cover 14 and the seal end cover 13 facing the tachometer rotor 12, a seal adjusting ring 18 surrounding the rotating shaft is further provided, namely, a seal adjusting ring 18 surrounding the tachometer shaft 16 or the rotating speed output shaft is further provided; the seal adjusting ring 18 is O-shaped, is sleeved on the seal end cover 13 and the flange seal end cover 14, and can effectively avoid liquid metal leakage; and further, the induction electrode 111 and the input electrode 121 cannot be immersed in the liquid metal at the same time, the effective induction electrode 111 and the input electrode 121 can be conducted in time, and the measurement stability and safety of the flange type liquid metal rotation speed sensor are improved.
Preferably, the surfaces of the flange sealing end cover 14 and the sealing end cover 13 facing the housing shaft 11 are provided with a second sealing groove 172 surrounding the rotating shaft, namely, a second sealing groove 172 surrounding the speed measuring shaft 16 or the rotating speed output shaft; a second gasket (not shown) is provided in the second seal groove 172. So as to effectively avoid the leakage of liquid metal at the contact surfaces of the surface sealing end cover 13, the flange sealing end cover 14 and the shell shaft 11; the induction electrode 111 and the input electrode 121 can not be immersed into the liquid metal at the same time, so that the induction electrode 111 and the input electrode 121 can be conducted in time, and the measurement stability and safety of the flange type liquid metal rotation speed sensor are improved.
The invention also provides a rotation speed measuring method for measuring the rotation speed of an object to be measured, which comprises the following steps:
the rotating speed output end of an object to be measured is connected with the speed measuring rotor of the flange type liquid metal rotating speed sensor;
after an object to be detected is started, the rotating speed R=N/(m×T) of the object to be detected, wherein N is the number of current pulse signals received by the current detection circuit in a time period T; m is the number of the input electrodes.
The rotating speed output end of the object to be detected can be a rotating speed output shaft, or the rotating speed output shaft and the speed measuring shaft are connected through a coupler; the connection mode of the rotating speed output end of the object to be detected and the speed measuring rotor of the flange type liquid metal rotating speed sensor comprises the following steps: the rotating speed output shaft is directly connected with the speed measuring rotor, or the speed measuring shaft is connected with the speed measuring rotor and fixedly connected with the rotating output shaft of the object to be measured through a coupler.
Based on the flange type liquid metal rotating speed sensor provided by the invention, the invention also provides a design method of the flange type liquid metal rotating speed sensor, which comprises the following steps:
step S11, according to the temperature condition of the use environment and the heat dissipation of the sensor, gallium indium alloy or gallium indium tin alloy manufactured in different proportions is selected, and the viscosity test is carried out under the test circuit condition;
step S12, designing a tachometer shaft, a key and a tachometer rotor with an input electrode according to the shaft diameter of the rotating speed output shaft and the rotating speed measurement requirement;
step S13, designing the size of a speed measuring cavity according to the viscosity test experiment in the step S11, and designing the number m of input electrodes of the speed measuring rotor according to the width of the speed measuring cavity and the rotating speed measurement requirement;
s14, designing a shell shaft barrel according to the installation environment and the position size, installing an induction electrode on the inner surface of the shell sleeve, and adjusting and measuring the actual effective gap of the cavity through the thickness of the seal adjusting ring;
and S15, installing the key and the tachometer rotor with the input electrode on the tachometer shaft according to the testing position of the input electrode on the tachometer rotor corresponding to the sensing electrode.
S16, designing a sealing end cover and a flange sealing end cover according to the size of the shell shaft barrel, designing a first sealing groove and a second sealing groove on the sealing end cover and the flange sealing end cover, and installing sealing gaskets in the first sealing groove and the second sealing groove; meanwhile, a sealing adjusting ring is sleeved on the sealing end cover and the flange sealing end cover, and the prepared liquid metal is filled into the speed measuring cavity and the leakage-proof characteristic of the speed measuring cavity is tested;
and S17, after the primary assembly, a power-on test experiment is required to be carried out, so that the effectiveness of the assembly is ensured.
Compared with the prior art, the invention provides a flange type liquid metal rotating speed sensor and a rotating speed measuring method; the flange type liquid metal rotating speed sensor comprises: the device comprises an insulated shell shaft barrel, a speed measuring rotor, a sealing end cover and a flange sealing end cover; the shell shaft is sleeved on the speed measuring rotor, the sealing end cover and the flange sealing end cover are respectively fixed at two axially opposite ends of the shell shaft and the speed measuring rotor to form a sealed speed measuring cavity, and liquid metal is stored in the speed measuring cavity; an induction electrode is arranged on the shell shaft barrel, and an input electrode is arranged on the tachometer rotor; the induction electrode and the input electrode are immersed in liquid metal and are respectively connected with the same speed measuring circuit; when the speed measurement is carried out, the current flows into the liquid metal through the input electrode, and when the input electrode and the sensing electrode are opposite in the same direction, a current pulse signal is output to the speed measurement circuit through the sensing electrode. And further, the load on the flange type liquid metal rotating speed sensor is effectively avoided, and the safety and stability of the flange type liquid metal rotating speed sensor are improved.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (10)
1. A flange type liquid metal rotation speed sensor for measuring the rotation speed of an object, comprising:
the device comprises an insulated shell shaft barrel, a speed measuring rotor, a sealing end cover and a flange sealing end cover;
the shell shaft is sleeved on the speed measuring rotor, the sealing end cover and the flange sealing end cover are respectively fixed at two axially opposite ends of the shell shaft and the speed measuring rotor to form a sealed speed measuring cavity, and liquid metal is stored in the speed measuring cavity;
an induction electrode is arranged on the inner side wall of the shell shaft barrel, an input electrode is arranged on the outer side wall of the tachometer rotor, and a gap is reserved between the induction electrode and the input electrode; the induction electrode and the input electrode are immersed in liquid metal and are respectively connected with the same speed measuring circuit;
when the speed measurement is carried out, current flows into the liquid metal through the input electrode, and when the input electrode and the sensing electrode are opposite in the same direction, a current pulse signal is output to the speed measurement circuit through the sensing electrode; the current in the input electrode enters the sense electrode through the liquid metal if and only if the input electrode and the sense electrode are diametrically opposed.
2. The flange type liquid metal rotating speed sensor according to claim 1, wherein the tachometer rotor is adapted to be connected with a rotating shaft; the rotating shaft is arranged to be a rotating speed output shaft or a speed measuring shaft connected with the rotating speed output shaft through a coupler.
3. The flange type liquid metal rotation speed sensor according to claim 2, wherein the tachometer rotor is provided in a hollow cylindrical shape and comprises a rotor inner surface facing away from the housing shaft, and one end of the rotating shaft is fixed in the rotor inner surface of the tachometer rotor.
4. The flange type liquid metal rotating speed sensor according to claim 3, further comprising a key, wherein a sliding key groove is formed in the inner surface of one end, close to the sealing end cover, of the tachometer rotor, and the key is slidably arranged in the sliding key groove and is used for fixing a rotating shaft on the inner surface of the tachometer rotor.
5. The flange type liquid metal rotation speed sensor according to claim 1, wherein the housing shaft comprises a sleeve inner surface adjacent to the tachometer rotor, and the tachometer rotor further comprises a rotor outer surface adjacent to the housing shaft; the induction electrode is arranged on the inner surface of the sleeve, the input electrode is arranged on the outer surface of the tachometer rotor, and the induction electrode and the input electrode are arranged on the same plane.
6. The flange type liquid metal rotating speed sensor according to claim 2, wherein a flange plate facing the tachometer rotor is arranged on the flange sealing end cover, and the flange plate is used for axially mounting the housing shaft barrel, the tachometer rotor and the rotating shaft.
7. The flange type liquid metal rotating speed sensor according to claim 2, wherein a first sealing groove surrounding the rotating shaft is formed in the surface of the flange sealing end cover and the surface of the sealing end cover, which faces the speed measuring rotor; a first sealing gasket is arranged in the first sealing groove.
8. The flange type liquid metal rotation speed sensor according to claim 2, wherein a seal adjusting ring surrounding the rotating shaft is arranged on the surface of the flange seal end cover and the surface of the seal end cover, which face the tachometer rotor.
9. The flange type liquid metal rotating speed sensor according to claim 2, wherein a second sealing groove surrounding the rotating shaft is formed in the surface of the flange sealing end cover and the surface of the sealing end cover, which face the housing shaft; and a second sealing gasket is arranged in the second sealing groove.
10. A rotational speed measuring method for measuring a rotational speed of an object to be measured, comprising:
connecting the rotating speed output end of an object to be measured with the speed measuring rotor of the flange type liquid metal rotating speed sensor according to any one of claims 1 to 9;
after an object to be measured is started, the rotating speed R=N/(m×T) of the object to be measured, wherein N is the number of current pulse signals received by the speed measuring circuit in a time period T; m is the number of the input electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910453613.3A CN110261638B (en) | 2019-05-28 | 2019-05-28 | Flange type liquid metal rotating speed sensor and rotating speed measuring method |
Applications Claiming Priority (1)
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